[TinCanAlley]

Originally Posted by zeno

All the transistors with different part ##'s are different. When you sub them you are getting same or better specs. Works MOST the time.
Also case style & pin out must be watched.

OEM transistors are selected closer to the needed specs
to save $$ and best match the design.

Most the time they make an " opposite sex" twin.
They show up in audio & vert outputs on TV's sometimes.
your TV uses none of the pairs as pairs.

Some places you should only use OEM transistors.
Horz output, IF & tuners, sometimes vert & audio out,
power supply regulators. Very brand specific as to
where you can get away with subs. Sometimes OEM's
cost less. If you get a common failure you may
stock the OEM instead of going to the subs.

73 Zeno

So even though the SM notes the part numbers from 4 different manufacturers, the specs might be slightly different than the OEM, but is supposed to work. Just a matter of trial and error.

I found a place that has about 60% of the ones I'm looking for of NOS Zenith parts. I think I'll grab those and start a hunt for more places.

Thanks for the info.